Corbet was elected Member of Parliament for Camberwell North West in 1945, though she did not attend many debates, focusing more on her municipal work.

She abstained against a three-line whip in 1972, allowing UK to join the European Common Market, and soon after announced her retirement from politics to spend more time with her unwell second husband, Ian McIvor Campbell.

She was the eldest child of her father Adolf Künzlen, a commercial clerk and her mother, Nellie, a political activist.

She married William Corbet, another member of the Independent Labour Party, on 5 August 1925 in Streatham, moving back to London, where her husband ran a sweet shop and newsagent.

Corbet served on the London County Council's education committee for 16 years, helping to introduce comprehensive schools to the city.

As a Member of Parliament she did not attend many debates, instead focussing on her local duties, including fortnightly surgeries for her constituents.

Corbet represented Britain at the United Nations conference in 1948, helping to produce the Universal Declaration of Human Rights.

There she oversaw the expansion of the South Bank, helping to establish Queen Elizabeth Hall and Purcell Room as well as the Hayward Gallery and the Royal National Theatre.